How do I remove WTAP encapsulation?

For the past few days, Wireshark can no longer display packets properly. All od them say "wtap_encap=1" in the info field.
I have not done anything intentionally.
Can anyone help removing this strange behaviour, please?
By the way, Wireshark is not necessarily the culprit, because I think I've seen the same thing with Packetyzer.
I have replaced Winpcap with Npap, to no avail.
Thank you

How do I remove WTAP encapsulation?

For the past few days, Wireshark can no longer display packets properly. All od them say "wtap_encap=1" in the info field.
I have not done anything intentionally.
Can anyone help removing this strange behaviour, please?
By the way, Wireshark is not necessarily the culprit, because I think I've seen the same thing with Packetyzer.
I have replaced Winpcap with Npap, to no avail.
Thank you